Which airspace class is classified as "restricted"?

The classification of "restricted" airspace is designated for areas where flight is prohibited unless under specific conditions, typically in emergencies. This type of airspace is established for various purposes, including military operations, hazardous activities, or for the protection of people and property on the ground. The restrictions in place are crucial for maintaining safety and security, ensuring that unauthorized flights do not enter these sensitive areas.

While other forms of airspace have their regulations regarding operations, such as only permitting VFR or requiring IFR, they do not equate to the absolute prohibition on entry found in restricted airspace. The essential feature of restricted airspace is that it strictly limits access to protect operations within it, only allowing entry when authorized, such as during emergencies, thus ensuring adherence to safety protocols.